/Engine/Plugins/Online/OnlineFramework/Source/Party/Public/Chatroom.h
true if the user is already logged as being a part of a given chat room, false otherwise
bool IsAlreadyInChatRoom ( const [FUniqueNetIdRepl](API\Runtime\Engine\GameFramework\FUniqueNetIdRepl) & LocalUserId, const [FChatRoomId](API\Plugins\OnlineSubsystem\Interfaces\FChatRoomId) & ChatRoomId ) const